Issue when emoji is located on boundary between two segments? about sms HOT 3 CLOSED

I don't have time to look into this at the moment, so feel free to identify how the segmentation algorithm is wrong and provide a patch, or at least provide examples where it is encoded as 3 segments to highlight the difference.
Most likely the existing algorithm will not split multi-byte characters across segment boundaries, which I believe is the safer option, independent of whether that situation is covered in the spec. That would explain the behaviour you describe.

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Thanks for a quick feedback.

Debugging that part is a bit out of my knowledge. I just wanted to report back when we discovered a potential issue. We currently only use this module to calculate how many segments this is going to be when sending it through a provider (which handles all these details for us).

The feedback from that provider is one source saying that specific message should be possible to send as three messages. Another source is this web based debugger: https://messente.com/documentation/tools/sms-length-calculator

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Which shows the 2nd emoji being split across the segment boundary, as I suspected.
You should ask your provider to give you an API that returns the lengths they will generate.

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